Thick water-based cosmetic

Abstract

The thick water-based cosmetic of the present invention has a viscoelastic ratio of 10 or more and a viscosity of 500 mPa·s or less at a shear rate of 1/s, wherein when concentrated by a factor of five by drying to remove moisture, the thick water-based cosmetic changes to a gel-like form having a viscoelastic ratio of 0.5 or less and a viscosity of 70000 mPa·s or more at a shear rate of 1/s.

1 . A thick water-based cosmetic having a viscoelastic ratio of 10 or more and a viscosity of 500 mPa·s or less at a shear rate of 1/s, wherein
 when concentrated by a factor of five by drying to remove moisture, the thick water-based cosmetic changes to a gel-like form having a viscoelastic ratio of 0.5 or less and a viscosity of 70000 mPa·s or more at a shear rate of 1/s. 
 
     
     
         2 . The cosmetic according to  claim 1 , wherein the cosmetic in the gel-like form has a viscoelastic ratio of 0.2 or less and a viscosity of 75000 mPa·s or more at a shear rate of 1/s. 
     
     
         3 . The cosmetic according to  claim 1 , wherein the cosmetic in the gel-like form has a viscoelastic ratio of 0.005 or more and a viscosity of 500000 mPa·s or less at a shear rate of 1/s. 
     
     
         4 . The cosmetic according to  claim 1 , wherein in the cosmetic, an oil-in-water emulsion containing oil droplets is mixed with a hydrophobically-modified polyether urethane. 
     
     
         5 . The cosmetic according to  claim 4 , wherein the average particle diameter of the oil droplets is 150 nm or less. 
     
     
         6 . The cosmetic according to  claim 4 , wherein the oil droplets contain oil and a surfactant. 
     
     
         7 . The cosmetic according to  claim 4 , wherein the hydrophobically-modified polyether urethan is represented by formula 1 below:
   R i —{(O—R ii ) k —OCONH—R iii [—NHCOO—(R iv —O) p —R v ]h} q   formula 1
   where R 1 , R ii , and R iv  each independently represent a C 2-4  hydrocarbon group,   R iii  represents a C 1-10  hydrocarbon group optionally having a urethane bond,   R v  represents a C 8-36  hydrocarbon group,   k is an integer of 1 to 500,   p is an integer of 1 to 200,   h is an integer of 1 or more, and   q is an integer of 2 or more.   
     
     
         8 . The cosmetic according to  claim 7 , wherein the hydrophobically-modified polyether urethane is a polyethylene glycol-decyl tetradeceth-hexamethylene diisocyanate copolymer.